When kids are born I believe they have no concept about what their life should look like, other than basic human needs and the fear of loud noise. As we grow up, we absorb the belief system of those who are around us most of the time, beginning with parents, then school, and so on. At some point that becomes our belief system, and we don’t even question it.
I am not saying this is right or wrong, it is what it is. Our belief system determines what we do, what profession we choose, what path we take in life, and so on. You’ve heard perhaps, that our thoughts affect out words, our words affect our beliefs, our beliefs affect our actions, our actions form our habits, and our habits create our destiny.